DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Implementation

Mercurial (5b81998bb7ab)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_places_History_h_
#define mozilla_places_History_h_

#include "mozilla/IHistory.h"
#include "mozilla/Mutex.h"
#include "mozIAsyncHistory.h"
#include "nsIDownloadHistory.h"
#include "Database.h"

#include "mozilla/dom/Link.h"
#include "nsTHashtable.h"
#include "nsString.h"
#include "nsURIHashKey.h"
#include "nsTObserverArray.h"
#include "nsDeque.h"
#include "nsIObserver.h"
#include "mozIStorageConnection.h"

namespace mozilla {
namespace places {

struct VisitData;

#define NS_HISTORYSERVICE_CID \
  {0x0937a705, 0x91a6, 0x417a, {0x82, 0x92, 0xb2, 0x2e, 0xb1, 0x0d, 0xa8, 0x6c}}

// Max size of History::mRecentlyVisitedURIs
#define RECENTLY_VISITED_URI_SIZE 8

class History : public IHistory
              , public nsIDownloadHistory
              , public mozIAsyncHistory
              , public nsIObserver
{
public:
  NS_DECL_ISUPPORTS
  NS_DECL_IHISTORY
  NS_DECL_NSIDOWNLOADHISTORY
  NS_DECL_MOZIASYNCHISTORY
  NS_DECL_NSIOBSERVER

  History();

  /**
   * Obtains the statement to use to check if a URI is visited or not.
   */
  mozIStorageAsyncStatement* GetIsVisitedStatement();

  /**
   * Adds an entry in moz_places with the data in aVisitData.
   *
   * @param aVisitData
   *        The visit data to use to populate a new row in moz_places.
   */
  nsresult InsertPlace(const VisitData& aVisitData);

  /**
   * Updates an entry in moz_places with the data in aVisitData.
   *
   * @param aVisitData
   *        The visit data to use to update the existing row in moz_places.
   */
  nsresult UpdatePlace(const VisitData& aVisitData);

  /**
   * Loads information about the page into _place from moz_places.
   *
   * @param _place
   *        The VisitData for the place we need to know information about.
   * @return true if the page was recorded in moz_places, false otherwise.
   */
  bool FetchPageInfo(VisitData& _place);

  /**
   * Get the number of bytes of memory this History object is using,
   * including sizeof(*this))
   */
  size_t SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf);

  /**
   * Obtains a pointer to this service.
   */
  static History* GetService();

  /**
   * Obtains a pointer that has had AddRef called on it.  Used by the service
   * manager only.
   */
  static History* GetSingleton();

  template<int N>
  already_AddRefed<mozIStorageStatement>
  GetStatement(const char (&aQuery)[N])
  {
    mozIStorageConnection* dbConn = GetDBConn();
    NS_ENSURE_TRUE(dbConn, nullptr);
    return mDB->GetStatement(aQuery);
  }

  bool IsShuttingDown() const {
    return mShuttingDown;
  }
  Mutex& GetShutdownMutex() {
    return mShutdownMutex;
  }

  /**
   * Helper function to append a new URI to mRecentlyVisitedURIs. See
   * mRecentlyVisitedURIs.
   */
  void AppendToRecentlyVisitedURIs(nsIURI* aURI);

private:
  virtual ~History();

  /**
   * Obtains a read-write database connection.
   */
  mozIStorageConnection* GetDBConn();

  /**
   * The database handle.  This is initialized lazily by the first call to
   * GetDBConn(), so never use it directly, or, if you really need, always
   * invoke GetDBConn() before.
   */
  nsRefPtr<mozilla::places::Database> mDB;

  /**
   * A read-only database connection used for checking if a URI is visited.
   *
   * @note this should only be accessed by GetIsVisistedStatement and Shutdown.
   */
  nsCOMPtr<mozIStorageConnection> mReadOnlyDBConn;

  /**
   * An asynchronous statement to query if a URI is visited or not.
   *
   * @note this should only be accessed by GetIsVisistedStatement and Shutdown.
   */
  nsCOMPtr<mozIStorageAsyncStatement> mIsVisitedStatement;

  /**
   * Remove any memory references to tasks and do not take on any more.
   */
  void Shutdown();

  static History* gService;

  // Ensures new tasks aren't started on destruction.
  bool mShuttingDown;
  // This mutex guards mShuttingDown. Code running in other threads that might
  // schedule tasks that use the database should grab it and check the value of
  // mShuttingDown. If we are already shutting down, the code must gracefully
  // avoid using the db. If we are not, the lock will prevent shutdown from
  // starting in an unexpected moment.
  Mutex mShutdownMutex;

  typedef nsTObserverArray<mozilla::dom::Link* > ObserverArray;

  class KeyClass : public nsURIHashKey
  {
  public:
    KeyClass(const nsIURI* aURI)
    : nsURIHashKey(aURI)
    {
    }
    KeyClass(const KeyClass& aOther)
    : nsURIHashKey(aOther)
    {
      NS_NOTREACHED("Do not call me!");
    }
    ObserverArray array;
  };

  /**
   * Helper function for nsTHashtable::SizeOfExcludingThis call in
   * SizeOfIncludingThis().
   */
  static size_t SizeOfEntryExcludingThis(KeyClass* aEntry,
                                         nsMallocSizeOfFun aMallocSizeOf,
                                         void*);

  nsTHashtable<KeyClass> mObservers;

  /**
   * mRecentlyVisitedURIs remembers URIs which are recently added to the DB,
   * to avoid saving these locations repeatedly in a short period.
   */
  typedef nsAutoTArray<nsCOMPtr<nsIURI>, RECENTLY_VISITED_URI_SIZE>
          RecentlyVisitedArray;
  RecentlyVisitedArray mRecentlyVisitedURIs;
  RecentlyVisitedArray::index_type mRecentlyVisitedURIsNextIndex;

  bool IsRecentlyVisitedURI(nsIURI* aURI);
};

} // namespace places
} // namespace mozilla

#endif // mozilla_places_History_h_